Iterating through an object array in js: skip when undefined

Question

I'd like to iterate trough a javascript array (nested objects: based on collection+Json) and collect data from its objects. But if the data of an object isn't available, skip it and go to the next object, resp. continue the iteration. Currently, this error appears if the data isn't available in the according object: Uncaught TypeError: Cannot read property 'hk5' of undefined

How can I check first, if the data (hereafter hk5) is available?

Iterating through all "data-objects"

for (var i = 0; i < data.collection.items.length; i++) {
    var data = data.collection.items[i].data[2].value.packet_data_field.application_data_params.hk5;
    console.log(belaMode);
}

Thanks!

By using an if statement. if statements let you conditional execute code. They look like if (some condition) { /*do something if true */ } else { /* do something if false */} — Felix Kling
– Felix Kling, Commented Jul 2, 2014 at 9:26

Rob Schmuecker · Accepted Answer · 2014-07-02 10:10:30Z

1

for (var i = 0; i < data.collection.items.length; i++) {
    if(typeof(data.collection.items[i].data[2].value.packet_data_field.application_data_params) != 'undefined'){
    var data = data.collection.items[i].data[2].value.packet_data_field.application_data_params.hk5;
    }
    console.log(belaMode);
}

edited Jul 2, 2014 at 10:10

answered Jul 2, 2014 at 9:26

Rob Schmuecker

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1 Comment

RobG Over a year ago

You've gone one property too far. The OP wants to test if application_data_params is undefined.

Darin Kolev · Accepted Answer · 2014-07-02 09:58:36Z

0

if(data.collection.items[i].data[2].value.packet_data_field.application_data_params!=undefined){}

edited Jul 2, 2014 at 9:58

Darin Kolev

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answered Jul 2, 2014 at 9:25

azero0

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